1 /*
2 * atmel_df_pow2.c - convert Atmel Dataflashes to Power of 2 mode
3 *
4 * Copyright 2009 Analog Devices Inc.
5 *
6 * Licensed under the 2-clause BSD.
7 */
8
9 #include <common.h>
10 #include <exports.h>
11 #include <spi.h>
12
13 #define CMD_ID 0x9f
14 #define CMD_STAT 0xd7
15 #define CMD_CFG 0x3d
16
flash_cmd(struct spi_slave * slave,uchar cmd,uchar * buf,int len)17 static int flash_cmd(struct spi_slave *slave, uchar cmd, uchar *buf, int len)
18 {
19 buf[0] = cmd;
20 return spi_xfer(slave, 8 * len, buf, buf, SPI_XFER_BEGIN | SPI_XFER_END);
21 }
22
flash_status(struct spi_slave * slave)23 static int flash_status(struct spi_slave *slave)
24 {
25 uchar buf[2];
26 if (flash_cmd(slave, CMD_STAT, buf, sizeof(buf)))
27 return -1;
28 return buf[1];
29 }
30
flash_set_pow2(struct spi_slave * slave)31 static int flash_set_pow2(struct spi_slave *slave)
32 {
33 int ret;
34 uchar buf[4];
35
36 buf[1] = 0x2a;
37 buf[2] = 0x80;
38 buf[3] = 0xa6;
39
40 ret = flash_cmd(slave, CMD_CFG, buf, sizeof(buf));
41 if (ret)
42 return ret;
43
44 /* wait Tp, or 6 msec */
45 udelay(6000);
46
47 ret = flash_status(slave);
48 if (ret == -1)
49 return 1;
50
51 return ret & 0x1 ? 0 : 1;
52 }
53
flash_check(struct spi_slave * slave)54 static int flash_check(struct spi_slave *slave)
55 {
56 int ret;
57 uchar buf[4];
58
59 ret = flash_cmd(slave, CMD_ID, buf, sizeof(buf));
60 if (ret)
61 return ret;
62
63 if (buf[1] != 0x1F) {
64 printf("atmel flash not found (id[0] = %#x)\n", buf[1]);
65 return 1;
66 }
67
68 if ((buf[2] >> 5) != 0x1) {
69 printf("AT45 flash not found (id[0] = %#x)\n", buf[2]);
70 return 2;
71 }
72
73 return 0;
74 }
75
getline(void)76 static char *getline(void)
77 {
78 static char buffer[100];
79 char c;
80 size_t i;
81
82 i = 0;
83 while (1) {
84 buffer[i] = '\0';
85
86 c = getc();
87
88 switch (c) {
89 case '\r': /* Enter/Return key */
90 case '\n':
91 puts("\n");
92 return buffer;
93
94 case 0x03: /* ^C - break */
95 return NULL;
96
97 case 0x5F:
98 case 0x08: /* ^H - backspace */
99 case 0x7F: /* DEL - backspace */
100 if (i) {
101 puts("\b \b");
102 i--;
103 }
104 break;
105
106 default:
107 /* Ignore control characters */
108 if (c < 0x20)
109 break;
110 /* Queue up all other characters */
111 buffer[i++] = c;
112 printf("%c", c);
113 break;
114 }
115 }
116 }
117
atmel_df_pow2(int argc,char * const argv[])118 int atmel_df_pow2(int argc, char * const argv[])
119 {
120 /* Print the ABI version */
121 app_startup(argv);
122 if (XF_VERSION != get_version()) {
123 printf("Expects ABI version %d\n", XF_VERSION);
124 printf("Actual U-Boot ABI version %lu\n", get_version());
125 printf("Can't run\n\n");
126 return 1;
127 }
128
129 while (1) {
130 struct spi_slave *slave;
131 char *line, *p;
132 int bus, cs, status;
133
134 puts("\nenter the [BUS:]CS of the SPI flash: ");
135 line = getline();
136
137 /* CTRL+C */
138 if (!line)
139 return 0;
140 if (line[0] == '\0')
141 continue;
142
143 bus = cs = simple_strtoul(line, &p, 10);
144 if (*p) {
145 if (*p == ':') {
146 ++p;
147 cs = simple_strtoul(p, &p, 10);
148 }
149 if (*p) {
150 puts("invalid format, please try again\n");
151 continue;
152 }
153 } else
154 bus = 0;
155
156 printf("\ngoing to work with dataflash at %i:%i\n", bus, cs);
157
158 /* use a low speed -- it'll work with all devices, and
159 * speed here doesn't really matter.
160 */
161 slave = spi_setup_slave(bus, cs, 1000, SPI_MODE_3);
162 if (!slave) {
163 puts("unable to setup slave\n");
164 continue;
165 }
166
167 if (spi_claim_bus(slave)) {
168 spi_free_slave(slave);
169 continue;
170 }
171
172 if (flash_check(slave)) {
173 puts("no flash found\n");
174 goto done;
175 }
176
177 status = flash_status(slave);
178 if (status == -1) {
179 puts("unable to read status register\n");
180 goto done;
181 }
182 if (status & 0x1) {
183 puts("flash is already in power-of-2 mode!\n");
184 goto done;
185 }
186
187 puts("are you sure you wish to set power-of-2 mode?\n");
188 puts("this operation is permanent and irreversible\n");
189 printf("enter YES to continue: ");
190 line = getline();
191 if (!line || strcmp(line, "YES"))
192 goto done;
193
194 if (flash_set_pow2(slave)) {
195 puts("setting pow2 mode failed\n");
196 goto done;
197 }
198
199 puts(
200 "Configuration should be updated now. You will have to\n"
201 "power cycle the part in order to finish the conversion.\n"
202 );
203
204 done:
205 spi_release_bus(slave);
206 spi_free_slave(slave);
207 }
208 }
209